Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the purpose of the redraw() method in the SineDraw class?

To reset the slider value
To draw a rectangle
To update the UI representation of the sine wave
To clear the canvas

The correct answer is: To update the UI representation of the sine wave

The redraw() method in the SineDraw class updates the UI representation of the sine wave. This means that the method is responsible for dynamically adjusting the visual display of the sine wave as the slider value is changed. Option A is incorrect because the redraw() method does not reset the slider value, it only updates the UI. Option B is incorrect because the method is not responsible for drawing a rectangle. Option D is incorrect because the method does not clear the canvas, it only updates the UI. In conclusion, the purpose of the redraw() method is to update the UI representation of the sine wave, making option C the correct answer.